# Subtraction with regrouping vs Intergalactic Rocket Trivia

The clearest difference is price: Intergalactic Rocket Trivia at Free against Subtraction with regrouping's $0.99. Intergalactic Rocket Trivia also leads on update cadence (every 4 weeks vs every 41 months) and device support (3 vs 1). Subtraction with regrouping's advantage is in-app purchases (none vs 1). On ads there is nothing between them.

Intergalactic Rocket Trivia is free to download; Subtraction with regrouping costs $0.99 up front. Intergalactic Rocket Trivia sells 1 one-off in-app purchase. Subtraction with regrouping asks for nothing beyond the download.

Subtraction with regrouping ships an update every 41 months, Intergalactic Rocket Trivia every 4 weeks. The most recent releases landed on October 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Subtraction with regrouping | Intergalactic Rocket Trivia |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/intergalactic-rocket-trivia/id1526165517/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 4 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 7 MB | 251 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Red Hong](https://appshunter.io/developer/542314714) | [Intergalactic Education LLC](https://appshunter.io/developer/1364648815) |

## What reviewers say

### Subtraction with regrouping

[App page](https://appshunter.io/ios/app/subtraction-with-regrouping/id838762880)

**Features:** macOS Compatibility

**In-app purchases:** none


### Intergalactic Rocket Trivia

[App page](https://appshunter.io/ios/app/intergalactic-rocket-trivia/id1526165517)

Test your knowledge of the solar system and space achievements with this trivia game. Earn rewards and launch rockets as you learn. Optional reports are available for deeper analysis.

**Highlights:** Space trivia questions, Solar system facts, Space achievements, Rocket launching gameplay, Progress tracking, Optional analysis reports

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rocket Report | $2.99 | one-time |


## Frequently asked questions

### Is Subtraction with regrouping free?

Subtraction with regrouping costs $0.99, with no in-app purchases.

### Is Intergalactic Rocket Trivia free?

Intergalactic Rocket Trivia is free to download, with in-app purchases available.

### Do Subtraction with regrouping or Intergalactic Rocket Trivia have ads?

Neither Subtraction with regrouping nor Intergalactic Rocket Trivia shows ads.

### Which is updated more often, Subtraction with regrouping or Intergalactic Rocket Trivia?

Subtraction with regrouping ships an update every 41 months, and Intergalactic Rocket Trivia every 4 weeks. Most recently, Subtraction with regrouping was updated on October 26, 2026 and Intergalactic Rocket Trivia on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*